Liquid fuel gasifier for absorption refrigerators



Sept. 24, 1963 R. D. POLISENA 3,104,534

LIQUID FUEL GASIFIER FOR ABSORPTION REFRIGERATORS Filed Dec. 28, 1960 3 Sheets-Sheet 1 INVENTOR R. D. POLISENA 3,104,534

3 Sheets-Sheet 2 m\ 90 Q m. \m OWN W P D\ O N\ O m. M\ N N N\% \QN Q Sept. 24, 1963 LIQUID FUEL GASIFIER FOR ABSORPTION REFRIGERATORS Filed Dec. 28, 1960 m lln mm Se t. 24, 1963 R. D. POLISENA LIQUID FUEL GASIFIER FOR ABSORPTION REFRIGERATORS Filed Dec. 28, 1960 3 Sheets-Sheet 3 INVENTOR x AMA Jz M BYT W United States Patent 3,104,534 LIQUID FUEL GASIFER FOR ABSORPTIUN REFRIGERATORS Ricardo Dante Poiisena, Buenos Aires, Argentina, as-

signor to Hidemar S.R.L., Buenos Aires, Argentina, a

limited liability company Filed Dec. 28, 196i), Ser. No. 79,950 11 Claims. (Cl. 62-448) This invention refers to a liquid fuel gasifier for absorption refrigerators ad more particularly to a rotary gravity-fed kerosene gasifier with a sole service burner, an auxiliary heating burner and a vaporizer to which the liquid fuel is supplied by gravity.

It is known that absorption refrigerators, in view of the absence of movable parts, do not suffer any mechanical wear and practically last forever, as far as the operation of the absorption refrigeration system is concerned. However, those absorption refrigerators in which the thermal energy required by the boiler is supplied by the combustion of one of the known hydrocarbons, for instance kerosene, sufler frequent interruptions which are exclusively due to the imperfections inherent in the kerosene gasifiers used at present for heating purposes.

In fact, if these heaters are of the type provided with a capillary wick, the latter is consumed inevitably during operation of the refrigerator, so that the burner must be frequently readjusted in order to obtain the desired blue flame, indicating perfect combustion.

On the other hand, if these heaters are formed with pressure or gravity-fed burners of the known type, practice has shown that these also require frequent readjustments in view of their relatively complicated structural nature.

Furthermore, at present the burners are mounted directly on the fuel deposit which is located at the bottom portion of the refrigerator cabinet, so that when it is necessary to adjust the burner in order to obtain a perfect combustion, it is necessary to move the relatively heavy fuel deposit and this, in the majority of the cases, represents a rather heavy and disagreeable task for the user.

Apart from that, the simple desire to observe the flame of the burner alone makes it necessary to move the heavy fuel deposit, since with the burner located at the lowest and posterior part of the refrigerator cabinet, the observation of the burner flame is practically impossible due to the extremely uncomfortable position which must be assumed by the observer.

It is true that some manufacturers have tried to obviate the lastly mentioned disadvantages by providing the burners with adjusting means which extend towards the front of the refrigerator cabinet and thus are more easily accessible to the user. However, it will be understood that even with the presence of such accessible adjusting means it is still necessary to observe the burner flame if a correct adjustment is to be obtained, so that here again one is confronted with the difficulty mentioned hereinbefore.

As regards the provision of a gravity-fed liquid fuel gasifier as a reliable heat source for absorption refrigeration system the main object of the present invention is to provide a liquid hydrocarbon gasifier formed mainly of three sub-assemblies, one of which corresponds to the tubular vaporizer provided with a wire-mesh filling, while the other corresponds to the service burner with the mixing chamber and auxiliary heating burner forming an integral part thereof, and the third sub-assembly corresponding to the support means on which the vaporizer and service burner assemblies are mounted in their correct operative relationships.

Each of these sub-assemblies is formed of a structural element of substantially simple construction and contains ice a minimum of individual parts which can be easily manufactured at a low cost by using mass-production techniques. On the other hand, the sub-assembly corresponding to the support means is designed to receive the vaporizer and service burner sub-assemblies by insertion into aligned seat openings and to retain them in their correct operative relationship with the use of only one retention means for each sub-assembly, so that the assembling and/ or disassembling of the improved hydrocarbon gasifier according to the present invention has been reduced to a task of utmost simplicity and case, which can be performed by a layman without the necessity of special knowledge and tools.

In accordance with this invention the vaporizer subassembly is constituted by an elongated tubular metal body including a wire-mesh filling with the entrance end coupled to the liquid fuel source, while the opposite end thereof is provided with a valved ejector nozzle of any known construction. The service burner sub-assembly is formed of a tubular and substantially vertical burner head to which is soldered one open end of a first tubular body corresponding to the mixing chamber, while a second U- shaped tubular body closed at one end thereof, is welded with its shorter arm to the tubular burner head at the open end thereof, the larger arm of the second U-shaped tubular body extending towards, below and beyond the first tubular body so as to constitute the auxiliary heating burner of the improved gasifier according to this invention. The support means sub-assembly is formed of a substantially horizontal stationary or rotary beam one end of which is supported by the refrigerator cabinet, while the opposite end thereof is provided with an upright bracket the frontal face of which carries a U-shaped seat, one upright arm of which is joined adequately to the upright bracket. 'I'his arm, together with the adjoining portion of the bracket, and the opposite arm of the U-shaped seat are each provided with two superposed openings conditioned to receive by insertion the tubular vaporizer body of the vaporizer sub-assembly and the salient portion of the second tubular body of the service burner sub-assembly in such a manner that this salient portion, corresponding to the auxiliary heating burner, is located below and along the final portion of the tubular vaporizer of the vaporizer sub-assembly.

According to a further feature of the invention, the service burner sub-assembly formed of the burner head, the first tubular body corresponding to the mixing chamber and the second tubular U-shaped body corresponding to the auxiliary heating burner is designed in such a manner that the combustible air-vaporized fuel mixture, on entering the burner head from the mixing chamber, is distributed in the correct volumetric proportions on one hand to the flame head of the service burner and, on the other, to the flame orifices of considerably lower consumption of the auxiliary heating burner. This can be achieved by using tubular bodies of different diameters for the first and second bodies of the service burner subassembly, by displacing vertically and/ or horizontally the outlet end of the first tubular body with respect to the inlet end of the shorter arm of the second tubular body while giving this latter body a diameter substantially equal to that of the first tubular body, or by combination of any of these means.

According to another feature of the present invention, the support means are constituted by a slightly inclined beam, one end of which carries the vertical seat for the vaporizer and burner sub-assemblies while the opposite end thereof is provided with a rotatable joint mounted on a stationary part of the lower portion of the refrigerator cabinet, so that the gravity-fed gasifier can be radially displaced between an interior operative heating position 3 and an exterior position of inspection in which the service burner is located at the front of the cabinet.

A further feature of the present invention is that the liquid fuel supply duct forms part of the rotatable joint so that the liquid fuel is carried to the tubular vaporizer of the gasifier by means of metallic pipes offering a maximum of safety against breakage and possible fires due to leakage of the liquid fuel.

This, one of the main objects of the present invention is to provide an improved liquid hydrocarbon gasifier having a sole service burner of extremely simple structure and reliable operation.

A further object of the present invention is to provide a gravity-fed kerosene gasifier formed of three sub-assemblies each of which is of a simple structure, can be easily manufactured at low cost and can be easily assembled to constitute the complete 'gasifier unit or disassembled for inspection or repairs.

Still another object of the present invention is to provide a service burner sub-assembly formed of three tubular bodies joined one to the other to constitute an integral metallic piece in which the correct distribution of the combustible gas between the service burner and the auxiliary heating burner is obtained in a simple and efiicient manner. 7

A further object of the present invention is to provide a rotatable support means sub-assembly for the service burner, to facilitate the adjustment and inspection of the burner flame in the frontal position of the gasifier.

Still another object of the present invention is to provide a rotatable support means sub-assembly with the liquid fuel supply pipes forming part of the rotatable joint.

Other objects and features of the invention become apparent as the specification proceeds.

The invention will now be more specifically described with reference to the accompanying drawings which are to be understood explicative of the invention and not limitative of its scope.

In the drawings:

FIG. 1 is a perspective view of the improved hydrocarbon fuel gasiiier according to the present invention;

FIG. 2 is a plan View of the same gasifier;

FIG. 3 is a lateral view in elevation, partly in section of the gasifier of the previous figures;

FIGS. 4 and 5 are lateral views in elevation, in section, of various embodiments of the service sub-assembly according to the present invention;

FIG. 6 is a lateral view in elevation of a further embodiment of the improved hydrocarbon fuel gasifier according to the present invention, mounted on rotatable support means sub-assembly;

PEG. 7 is a plan view of the gasifier and support means of FIG. 6, and finally,

FIG. 8 is a vertical cross-section of the rotatable joint of the support means shown in FIGS. 6 and 7.

In the drawings, corresponding parts orelements carry the same reference letters or numerals.

The improved liquid hydrocarbon gasifier according to this invention and shown in FIGS. 1 to 3, is of the gravity-fed kerosene burning type, and is especially adapted to be used as a source of thermal energy in absorption refrigeration installations. It is formed of a vaporizer subaassembly a, a service burner sub-assembly b and a support means sub-assembly c.

Vaporizer sub-assembly a is of the type already known and widely used in gravity-fed kerosene gasifier install ations and comprises a tubular vaporizer body 1 which in cludes a filling of wire-mesh material 2, the inlet end of which is provided with a lateral connector 3 to which is coupled a liquid fuel supply duct or pipe 4 the other end of which is connected to a liquid fuel tank not shown in the drawings. In a gravity-fed gasifier installation this fuel tank is mounted at some 60 to 100 cm. above the gasifier assembly. It will be understood however, that partly burner 4 the liquid fuel can be also supplied to vaporizer 1 at a reduced pressure from a tank located below the gasifier assembly. As usual, the opposite end of vaporizer 1 is provided with a valved ejector nozzle S'of known construction, which is governed by means of stem 6 mounted movable flame head It formed of a metallic or ceramic disc provided with a plurality of flame orifices 11. A first tubular body 12 is joined, such as by welding, to burner head 9 substantially at a right angle with respect to the upright longitudinfl axis of burner head 9, this first tubular body corresponding to the mixing chamber, as will be explained hereinafter, having an inlet end 12" and an outlet'end 12' in communication with the interior of burner head 9, as can be observed in FIG. 3. A second U-shaped tubular body 13 is joined, with the open end 13' of the shorter arm 13a thereof, to burner head 9 in such a manner that inlet end 13 is located at a substantially diametrically opposite position with respect to outlet end 12' of mixing chamber 12 and the longerarm 13b thereof extending towards below and beyond the inlet end 12" of mixing chamber 12, as can be observed in FIG. 3. That portion ofsecond tubular body 13, which extends beyond mixing chamber 12, is provided with a rowof flame orifices 14 and is closed at its end to constitute, in this portion the auxiliary heating burner of the improved gasifier according to the present invention.

According to one feature of this invention, mixing chamber 12 is of a larger diameter than auxiliary heating burner 13 of the service burner sub-assembly b. Support means sub-assembly c of the improved gasifier according to this invention is constituted of a substantially horizontal beam 15 which can be of the stationary or rotary type, one end of which (not shown in FIG. 1) is supported by the refrigerator cabinet while the opposite tree end thereof carries an upright U-shaped bracket 16 to the frontal face of which is joined, such as by welding, a U-shaped member 19, the lower bottom portion of which is closed by two lateral walls 20 to constitute a preheating trough tor vaporizer 1, as will be explained hereinafter. The upright bottom portion of U-shaped bracket 16 is provided with two superposed openings :17 and 18, these openings being also provided in the adjoining vertical arm 19' of seat 19. The opposite arm 19 of seat 19 is also provided with two superposed openings 21 I and 22, the upper pair of openings 17 and 21 constituting the respective seat for tubular vaporizer 1 and ejector nozzle 5 thereof While the lower pair of openings 18 and 22 constituting the seats for portion 13b of tubular mix ing chamber 13.

Thus, on assembling the present invention, openings 17 and 21 of support. means assembly c and the improved gasifier according to is retained in the final position by means of a screw 23 provided in one of the lateral flanges of bracket 16, as can be observed in FIG. 2. Then, portion 13b of the burner. head sub-assembly b is inserted, from the opposite direction, into openings 22 and 18 of support means sub-assembly 0 till inlet end 12" of mixing chamber 12 is located in front of but separated from ejector nozzle 5 of vaporizer 1, as can be observed inFIG. 3. In this position, service burner sub-assembly b is locked in place by means of screw 24 provided in the opposite lateral flange of bracket 16 (vide FIG. 2).

As can be observed in FIG. 3, service burner sub-astubular vaporizer 1 is inserted into sembly b is designed in such a manner that, when correctly locked in place in suport sub-assembly c, mixing chamber 12 is arranged in alignment with the outlet opening of ejector nozzle 5 of vaporizer 1, and the salient portion 13b of the second tubular body thereof extends below and along the final portion of vaporizer tube, so that the flames issuing from flame orifices -14 of auxiliary heating burner 13 are conditioned to heat and evaporate the liquid fuel flowing through vaporizer 1.

In order to steady the flames emerging from flame orifices 11 of service burner '9, flame head is coaxially surrounded by a chimney 25 which, being provided with an observation window 26, is mounted on burner head 9 by means of a screw 25 and is slightly separated from theouter wall thereof, so that during the operation of the gasifier according to the present invention, the hot air surrounding burner head 9 ascends along flame head 10 in the form of an annular current. Thus, the individual flames of the service burner combine to form one flame of substantially conical configuration, which is very useful when the gasifler according to the present -in vention is used as a source of thermal energy in absorption refrigeration systems.

In order to protect the small individual flames of auxiliary heating burner 13b against air currents which might blow-out these flames and thus affect the operation of the gasifier according to the present invention, there is provided a U-shaped tiltable cover 27 having a hinge 28 located in a slot 29 of bracket 16, as can be observed in FIG. 1. Lateral arms 27 of cover 27 are directed downwards and, as can be observed in FIG. 3, laterally enclose the space which contains ejector nozzle 5, inlet end 12" of mixing chamber 12 and flame orifices 14 of auxiliary heating burner 13. Each arm 27' is provided with a row of openings 39 to facilitate the flow of air towards inlet end 12" of mixing chamber 12.

FIG. 4 illustrates another embodiment of a burner subassembly b in which tubular mixing chamber 31 and tubular U-shaped auxiliary heating burner 32 are of different diameters but are mounted in alignment with their ends joined to tubular burner head 9. Since tubular auxiliary heating burner 32 is of a smaller diameter, the combustible air-vaporized fuel mixture entering the burner head 9 is correctly distributed between flame head 10 and flame orifices 14 of the auxiliary heating burner.

The same result can be also obtained with burner subassembly b shown schematically in FIG. 5, in which tubular chamber 33 and tubular auxiliary heating burner 34 are of substantially the same diameters. In order to achieve the correct distribution of the combustible air-vaporized fuel mixture entering burner head 9 through outlet end 33 of mixing chamber 33, inlet end of auxiliary heating burner 34 is joined to burner head 9 at a point located below outlet 33' of mixing chamber 33 so that the larger portion of the flow of combustible gas, circulating through mixing chamber 33 flows to flame head 10, a smaller portion thereof entering into auxiliary heating burner 34.

In the service burner sub-assembly b shown in the accompanying drawings, the outlet end of the mixing chamber is located diametrically across tubular burner head 9 with respect to the inlet end of the auxiliary heating burner. It should be understood, however, that the posi tions of these ends can be different without affecting the correct operation of the service burner sub-assembly b of the gasifier according to the present invention.

With respect to the embodiment of the gasifier shown in FIGS. 6, 7 and 8, it can be observed that rotatable support means sub-assembly c is constituted by two parallel metal strips the free ends of which carry vertical bracket 16, while the opposite and lower ends thereof are curved to form a brace 35 provided with adjusting screws 36 and surrounding a rotary cylindrical bushing 37 which forms part of rotatable joint a, as can be observed in FIG. 8. Bushing 37 is rotatably seated with the lower border thereof on a cross-beam of the refrigerator cabinet (not shownin the drawings) provided With an absorption refrigeration system the boiler 51 of which is partially shown in FIG. 6. Both arms of brace 35 are tightly pressed against bushing 37 but do not contact cross-beam 5(3, and in the position shown in FIG. 6 service burner 9 is maintained in the correct heating position below boiler 51 of the refrigerator. Support means c are provided with a handle 52 so that the entire gasified assembly can be radially moved either to the operative heating position as shown in FIG. 6 or to the positionof inspection in which burner 9 is located in the frontal part of the refrigerator cabinet.

Bushing 37 forms a part of a rotatable joint d which further comprises a stationary cup 38 which is maintained in its stationary position due to the pressure exercized bya cylinder 39 coaxially mounted in the interior of the same and the lower portion 39' of which, of smaller diameter passes through an aperture provided in the bottom of cup 38 and carries a screw-thread capable of receiving a pressure nut 40 and a further coupling nut (not shown) for the end of liquid fuel feeder pipe 53, the other end of which is connected to the liquid fuel deposit not shown in the drawings.

In order to block the rotation of cylindrical cup 38, a portion 39 of part 39' of cylinder 39 does not carry a thread and can 'be provided with a plane surface which is then inserted, with a tight fit, into apertures, of adequate con-formation provided in the bottom of cup 38 and crossbeam 50, thus obtaining a satisfactory locking of cup 38 with respect to cross-beam 50 of the refrigerator cabinet.

In the interior of stationary cylinder 39 there is mounted a piston 41 the longitudinal bore 42 of which is aligned with longitudinal bore 43 provided in lower portion 39' of cylinder 39, piston 4-1 being inserted with a close fit in the interior perforation of cylinder 39. The upper portion 41 of piston 41 is of smaller diameter and extends beyond the upper rim of cup 38, the end thereof being provided with a thread conditioned to receive a coupling nut 43 (FIG. 6) for the corresponding end of pipe 4.

In the annular space which is formed between the inner wall of stationary cylinder 39 and the exterior wall of smaller diameter 41 of piston 41, there is mounted a helical compression spring 54 the pressure of which can be adjusted by means of a nut 44 which is threaded on a thread provided on the exterior wall of the upper border of cylinder 39, so that piston 41 is strongly pressed against seat 45 of cylinder 39, thus forming a tight rotatable joint between stationary fuel supply pipe 53 and movable supply pipe 4 which is connected to tubular vaporizer 1.

The salient end of portion 41' of piston 41 is provided with two diametrially opposed cuts 46 conditioned to receive the bifurcated end of a lever 4-7 (FIG. 6) the other end 47 of which is bent downwards and is locked between the two strips 15 of support means 0, as can be observed in FIG. 7. Thus, piston 41 must follow the rotary movement of support beam 0 but, in view of the perfect adjustment between piston 41 and seat 45 and the inner wall of cylinder 39, the slidable joint between rotary piston 41 and stationary cylinder 39 is perfectly tight, so that there is no leakage of liquid fuel at this point.

On the other hand, in this connection cup 38 operates as a liquid fuel collector, since any liquid fuel which has leaked outside through the joint between piston 41 and stationary cylinder 39 penetrates automatically into the interior of cup 38 and can be extracted therefrom when need be.

In view of rotary joint d, the gasifier assembly can be easily moved to .a position in the back of the lower part of the refrigerator cabinet, Where service burner 9 is located below boiler 51 (as shown in FIG. 6) or to a position of inspection in which burner 9 is located practically in the frontal plane of the refrigerator cabinet. Since in any of the above two extreme positions, the supply of 7 liquid fuel through pipes 30, rotary joint d and pipe 4 is maintained without interruption, the gasifier can be easily adjusted so as to provide a flame with a perfect combustion.

It will be appreciated that modifications of disclosed embodiments of my invention are possible without departing from the spirit of the invention or the scope of the ap pended claims.

What I claim is:

1. A liquid hydrocarbon gasifier comprising a vaporizer sub-assembly formed of a tubular elongated vaporizer including a wire-mesh-filling and having an outlet end provided with a valved vaporized fuel ejector nozzle and a liquid hydrocarbon inlet end, a service burner sub-assembly formed of a tubular substantially upright burner head closed at its lower end and provided with a flame head at its upper end, a first tubular body joined with one end to said tubular burner head and extending substantially perpendicularly to the upright longitudinal axis of said burner head, a second tubular U-shaped body joined with the open end of one arm thereof to said tubular burner head while the other arm thereof has a closed end and extends towards, below and beyond saidfirst tubular body and is provided at its salient portion with a row of flame orifices to constitute an auxiliary heating burner, a support means sub-assembly formed of a substantially horizontal beam carrying at the free end'thereof a substantially perpendicular bracket, said bracket having secured to the frontal face thereof a U-shaped seat member with one upright arm thereof joined to said frontal face of said bracket, said bracket and said joining arm of said U- shaped seat member having a pair of superposed openings therein, the oppositeupright arm of said U-shaped seat member having a second pair of superposed openings therein, said two upper and two lower openings being .ar ranged in substantially horizontal alignment and in two substantially parallel planes, said two upper openings being adapted to receive by insertion said tubular vaporizer while said two lower openings being conditioned to receive by insertion the salient portion of the longer arm of said second tubular body of said service burner sub-assembly, with the open end of said first tubular body of said service burner sub-assembly looking toward but separated from said ejector nozzle of said vaporizer sub-assembly, and means to lock said vaporizer and said service burner subassemblies in said support means sub-assembly.

2. A liquid hydrocarbon gasifier according to claim 1, wherein one end of said first tubular body of said service burner sub-assembly is joined to said burner head with substantially diametrical opposition with respect to the open end of said second U-shaped tubular body.

3. A liquid hydrocarbon gasifier according to claim 1, wherein one end of said first tubular body of said service burner sub-assembly is joined to said burner head .at a level which differs from the level corresponding to the open end of said second tubular U-shaped body of said service burner sub-assembly.

4. A liquid hydrocarbon gasifier according to claim 1, wherein said first and said second tubular bodies of said service burner sub-assembly are of substantially equal diameters.

5. A liquid hydrocarbon gasifier according to claim 1, wherein said first and said second tubular bodies of said service burner sub-asembly are of difierent diameters.

6. A liquid hydrocarbon gasifier according to claim 5, wherein said first tubular body of said service burner subopposite said substantially vertical bracket, are curved to I comprising a tiltable U-shaped cover having two opposite depending lateral arms enclosing said salient portion of said second tubular body and the open end of said first tubular body of said service burner sub-assembly and said ejector nozzle of said vaporizer sub-assembly.

9. A liquid hydrocarbon gasifier according to claim 8 wherein said opposite lateral depending arms of said tilt-. able cover are provided each with a row of air intake openings.

10. A liquid hydrocarbon gasifier according to claim 1, in combination with a refrigerator cabinet including a refrigeration system having a boiler, wherein said support means sub-assembly is provided, at the end thereof opposite said substantially perpendicular bracket, with a.

rotatable sea-t mounted on said refrigerator cabinet, the V gasifier being radially movable between an operative position of heating said boiler and a position of inspection in which the service burner is located substantially in the. I frontal plane of said refrigerator cabinet. I

'11. A liquid hydrocarbon gasifier according toclaim 10. wherein said supportsub-assembly means are formed of two substantially parallel metal strips the end of which,

form a brace around a rotary cylindrical bushing'the lower rim of which is seated on a cross-beam of said refrigerator cabinet, a stationary cylindrical cup mounted on said cross-beam and constituting the guiding means for said rotary cylindrical bushing, a stationary cylinder.

mounted coaxially Within said cup provided with a longitudinal bore, and having one't-hreaded end passing through an aperture provided in said cross-beam and the bottom of said cylindrical cup, a nut located on said threaded end to lock said cylinder and said cup on said cross-beam, a piston rotatably mounted in the longitudinal bore .of said cylinder and provided with a longitudinal perforation, a compression spring located between said piston and a nut screwed on the threaded upper end of said cylinder, a lever joined with one end thereof to the upper end of said piston and coupled with the other end thereof to said support beam, a liquid fuel supply pipe joined with one end thereof to the Upper end of said piston and joined with the other end thereof to said tubular gasifier, and a second liquid fuel supply pipe connected between theliquid fuel storage tank and the threadedend of said cylinder.

7 References Cited in the file of this patent UNITED STATES PATENTS 

1. A LIQUID HYDROCARBON GASIFIER COMPRISING A VAPORIZER SUB-ASSEMBLY FORMED OF A TUBULAR ELONGATED VAPORIZER INCLUDING A WIRE-MESH FILLING AND HAVING AN OUTLET END PROVIDED WITH A VALVED VAPORIZED FUEL EJECTOR NOZZLE AND A LIQUID HYDROCARBON INLET END, A SERVICE BURNER SUB-ASSEMBLY FORMED OF A TUBULAR SUBSTANTIALLY UPRIGHT BURNER HEAD CLOSED AT ITS LOWER END AND PROVIDED WITH A FLAME HEAD AT ITS UPPER END, A FIRST TUBULAR BODY JOINED WITH ONE END TO SAID TUBULAR BURNER HEAD AND EXTENDING SUBSTANTIALLY PERPENDICULARLY TO THE UPRIGHT LONGITUDINAL AXIS OF SAID BURNER HEAD, A SECOND TUBULAR U-SHAPED BODY JOINED WITH THE OPEN END OF ONE ARM THEREOF TO SAID TUBULAR BURNER HEAD WHILE THE OTHER ARM THEREOF HAS A CLOSED END AND EXTENDS TOWARDS, BELOW AND BEYOND SAID FIRST TUBULAR BODY AND IS PROVIDED AT ITS SALIENT PORTION WITH A ROW OF FLAME ORIFICES TO CONSTITUTE AN AUXILIARY HEATING BURNER, A SUPPORT MEANS SUB-ASSEMBLY FORMED OF A SUBSTANTIALLY HORIZONTAL BEAM CARRYING AT THE FREE END THEREOF A SUBSTANTIALLY PERPENDICULAR BRACKET, SAID BRACKET HAVING SECURED TO THE FRONTAL FACE THEREOF A U-SHAPED SEAT MEMBER WITH ONE UPRIGHT ARM THEREOF JOINED TO SAID FRONTAL FACE OF SAID BRACKET, SAID BRACKET AND SAID JOINING ARM OF SAID USHAPED SEAT MEMBER HAVING A PAIR OF SUPERPOSED OPENINGS THEREIN, THE OPPOSITE UPRIGHT ARM OF SAID U-SHAPED SEAT MEMBER HAVING A SECOND PAIR OF SUPERPOSED OPENINGS THEREIN, SAID TWO UPPER AND TWO LOWER OPENINGS BEING ARRANGED IN SUBSTANTIALLY HORIZONTAL ALIGNMENT AND IN TWO SUBSTANTIALLY PARALLEL PLANES, SAID TWO UPPER OPENINGS BEING ADAPTED TO RECEIVE BY INSERTION SAID TUBULAR VAPORIZER WHILE SAID TWO LOWER OPENINGS BEING CONDITIONED TO RECEIVE BY INSERTION THE SALIENT PORTION OF THE LONGER ARM OF SAID SECOND TUBULAR BODY OF SAID SERVICE BURNER SUB-ASSEMBLY, WITH THE OPEN END OF SAID FIRST TUBULAR BODY OF SAID SERVICE BURNER SUB-ASSEMBLY LOOKING TOWARD BUT SEPARATED FROM SAID EJECTOR NOZZLE OF SAID VAPORIZER SUB-ASSEMBLY, AND MEANS TO LOCK SAID VAPORIZER AND SAID SERVICE BURNER SUBASSEMBLIES IN SAID SUPPORT MEANS SUB-ASSEMBLY. 